Metal roofing



Patented Feb. 15, 1938 VUNITED As'mint'.:s

PAT-ENT FPi-CE 2.108.350' j v l RoolrusrdV Karl Roth, Terre Haute, Ind.'Y Y" 1 Application July 1.6, 193.7, 1seria-1N41f1f5a955 1 claim.lering-18') `'Illhis invention relates to metal roofing `and has for aprimary object the provision of a metalY sheet unit which may be used inmultiple in laying roofs, the main feature being -that each 5v unit maybe originally coated in a flat sheet and then rolled or otherwise formedinto such shape that there will be no ,sharp bends but only smooth,rounded corners, whereby the coating may remain firmly attached to thelsheet Withlol out vdanger of its peeling at the bends or 4curves as hasbeen heretofore encountered in roofing units of the nature hereinemployed.

A still further'important advantage of the vinvention is that theindividual units may be lsel5` cured to the roof sheathing by nailsdriven through a corrugation of major height and,

additional nails may be driven through intermediate corrugations ofminor height so as to bring the individual units down into rm contactwith the sheathing Vwhere irregularities Aof the sheathing may exist. Astill further important featureA of the inven tion is that the majorcorrugations may have y the side walls closely approach theperpendicular 25. SO as to resist distortion Whenthesecuring nails aredriven therethrough.

A still further important feature of the invention is found in theparticular joint between the adjacent units which effectively preventsWater leakage and'at the same time avoids any sharp bends in themarginal edges of the sheets.

These and many other important features and advantages of the inventionwill be apparent to those versed in the art in the following descriptionof the invention as illustrated in one parvticular form in theaccompanying drawing, in

which:

Fig. 1 is a top plan view of a fragment of roof embodying the invention.

Fig. 2, a transverse vertical section on line 2 2; and

Fig. 3, a detail in vertical transverse section through a. modied formof lap between the sheets.

Like characters of reference indicate like parts throughout the severalviews in the drawing.

The metal sheet, generally designated by the numeral I0, is initiallyprovided with some protective coat, such as zinc, while still in theflat sheet. The coated sheet is then pressed or preferably rolled toprovide a plurality of spaced apart major ridges II, herein shown asthree in number. Between these major ridges II are a 55 plurality ofminor ridges I2 with intervening grooves I 3,providing the sheet withmajor and minor .corrugatonsf Referring toFig. 2,` sheet Ill when laidin the position indicated, has on its. right hand side a tail piece I4,extending outwardly from the lower end of the outer ridge II in theplane including the under sides of the groovesr I3. The `flat tailportion' `I4 continues from. under the rst groove I3, across under therst minor ridge I2 and then curves upwardly and around under the secondminor ridge I2 in a' compressive contact thereunder to terminate in aline at least s1ightly beyond the center of the second minor ridge I2..Also itis to be noted that the rst ridge ll, onuthe 'left hand side ofthe sheet I0 in this case, has its-outer lower longitudinal edge I5spaced a distance above the bottom of the groove I3 suiici'ently topreventwater coming down the roof Yfrom passing thereunder. That is, theedge I5-is spaced above any likely depth of water that may appear `onthe roof. This left hand ridge I'I lapsl over lthe right hand majorridge'I I' and has the rst two grooves I3 resting by their undersides onthe tail portion I4 of the next adjacent sheet. What moisture may creepup- Wardly-past edge I5, under the overlapping ridge I'I and over the-underlapping ridge 'I-I is caught over the tongue I4 as it approachesthe minor ridge I2 in an air space there provided to break up thecapillary action. This trapped moisture may then flow downwardly overthe tongue portion I4 without travelling further transversely since theright hand end of the tongue I4 curls up and under and is in contactwith the under side of the second minor ridge I2.

As indicated in Fig. 3, the major ridges II are of considerableelevation, in fact, are made to be higher than the ridges heretoforecommonly employed in a corresponding sheet. The main feature in thesemajor ridges II is that their side Walls are carried upwardly toapproach the perpendicular plane, whereby these ridges will not becomedistorted when the securing nails I6 are driven downwardly therethroughin the sheathing I1 thereunder. These nails I6 are preferably` providedwith lead washers I8 under'their heads as is the usual practice toprevent leakage around the nails. It is to be noted that by providingthese major ridges Il, through which the nails enter, combined with theminor corrugations, there are no sharp bends at the base of the majorridges as has heretofore been the case, and yet suicient rigidity issecured to permit driving the nails I6. Furthermore, by providing theminor corrugations between the major ridges there is sufficientelasticity to provide pushing toward the side Walls of the major ridgesin opposition to downward and spreading action by the pressureoccasioned by driving the nails I6 as will cause permanent pressureagainst the lead Washer I8, to maintain a permanent Water seal withoutlifting the nails and at the same time permit expansion and contractionof the sheets under various weather conditions. Again as aboveindicated, such as when there may be irregularities in the spacing andelevation ofthe sheathing boards II, nails may be driven through theminor ridges I2 as desired, all-without occasioning leakage through thesheet, since these minor ridges I2 have their upper portions above theusual level that may be reached. p As indicated in Fig. 2, the tailportion extending from the right hand ridge II, may be shortenedV fromthe tail I4 as indicated in Fig. 2, to have the tail portion I9 in Fig.3 extend in a at manner from under the first groove I3 across the firstminor ridge I 2 and then turn upwardly into'ntimate contact withtheouter downwardly sloping portion of the ridge I2, whereby an airspace 20 is provided to break up capillary action between theoverlapping sheet portion. f This modified form as shown in Fig. 3 maybe utilized where the sheet employed in Fig. 2.

It is therefore apparent that in` the .unique structure above described,a great many advantages are to be had over and above the vtype of metalroof sheets heretofore employed. There are no sharp bends, grooves, norridges in my structure so that there is no occasion for the coating tostart peeling at any place as afresult of the forming of the sheet.Corrugations are formed of sufficient radius to prevent separating ofthecoating from the sheet. Not only are the above indicated mechanicalfeatures obtained in myinvention, but there is a highly desirablyaesthetic appearance obtained by reason of the existence of the minorcorrugations between the major ridges. An additional feature that may benoted in the sheets formed in accordance with this invention, is thatthey may be nested and shipped readily without damaging the longitudinaledges as is Ill is of a narrower width than thatapparent in heretoforeexperience with sheets formed with V-like longitudinal edges.

While I have herein described my invention in the form as is now knownto me, it is obvious that structural changes may be employed withoutdeparting from the spirit of the invention and I therefore do not desireto be limited to that precise form beyond the limitations of thefollowing claim.

I claim:

VA coated metal roofing sheet comprising a plurality of spaced apartupwardly extending major ridges, a plurality of corrugations interveningbetween said ridges, the under sides of the grooves of thev interveningcorrugations being in a common plane and the upper sides of the ridgesof the intervening corrugations being in a common plane, the upper sidesof said major ridges being Vin a plane removed above the upper plane ofsaid corrugation ridges, said major ridges being curved upwardly from` agroove of said vcorrugations lto have aside wall sloping but slightlyoutwardly from the perpendicular and having a top curving over andaround therefrom into a downturned side wall of the same rate of butoppositely directed slope as that of the first wall, all of the saidgrooves and ridges including those in said corrugations and said majorridges being of suflicient curvature when formed as will retain saidcoating thereover in intimate contact without rupture, one of said majorridges being along one side of the sheet and having its outer downturnedwall terminating by a longitudinal edge at an elevation at least as highas the tops of the ridges' of said corrugations, and another of saidmajor ridges being adjacent to the opposite sheet edge to have the outerwall of that ridge curved around into a laterally extending tongue in aplane common to that of the undersides f said corrugations, and an outerupturned end'on said tongue, said tongue end being positioned under thesecond of the minor ridges of said corrugations, said tongue end beingcurved around under and in intimate Contact with the underside of thatsecond minor ridge. v l

KARL ROTH.

